One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(10,14)(11,12)(18,22)(19,25)(20,27)(23,28)(24,31)(29,30) involution — undirected(1,3)(2,5)(4,7)(6,8)(9,10)(11,16)(12,15)(13,14)(18,23)(19,25)(22,28)(26,32) involution — undirected(3,7)(5,8)(9,11,13,12)(10,15,14,16)(17,18,21,23)(19,24,25,30)(20,28,27,22)(26,31,32,29)(2,6)(3,7)(9,11,13,12)(10,16,14,15)(17,19)(18,24)(20,26)(21,25)(22,29)(23,30)(27,32)(28,31)(3,7)(5,8)(9,12,13,11)(10,16,14,15)(19,25)(24,30)(26,32)(29,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.